Adidas and Nike jostle for edge at the World Cup

The competition on the pitch has yet to start, but the fight over World Cup consumers is already intense -- and no more so than between the athletic companies that are jockeying for their once-every-four-years shot at the ever-growing worldwide soccer market.

Argentina's Lionel Messi, left, fights for the ball with Slovenia's Bostjan Cesar during their international friendly soccer match in La Plata, Argentina, Saturday, June 7, 2014. Argentina's team is leaving June 9 for Brazil to compete in the World Cup. (AP Photo/Natacha Pisarenko)
Photo by Associated Press